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Why Landlords Should Get an Annual Gas Safety Check A CP12 certificate means that a registered engineer inspected the gas appliances pipes, flues and pipes in your home and discovered that they were safe. Landlords are required to conduct regular inspections. Only an engineer who has been vetted by Gas Safe Register is able to issue an CP12. Checks usually take between 30 and 60 minutes. Installation Gas Safety Certificates (also called CP12 Certificates) are legal docum